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Following is sample code from suite answer 

function clientPostSourcing(type, name) {
	// Execute this code when all the fields from item are sourced on the sales order.
	 
	  if(type === 'item' &amp;&amp; name === 'item')
	  {
	    // After all the fields from item are sourced
	    var rate = nlapiGetCurrentLineItemValue('item', 'rate');
	    var line = nlapiGetCurrentLineItemIndex(type);
	 
	    if(rate &lt; 10)
	    {
	        nlapiSetCurrentLineItemValue('item', 'rate', 20);
	    }
	  }  
}